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/** @file
*
Memory Debug Log Library - PEI Phase
Copyright (C) 2025, Oracle and/or its affiliates.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <PiPei.h>
#include <Library/PeiServicesLib.h>
#include <Library/QemuFwCfgSimpleParserLib.h>
#include <Library/MemDebugLogLib.h>
EFI_PHYSICAL_ADDRESS mMemDebugLogBufAddr;
BOOLEAN mMemDebugLogBufAddrInit;
EFI_STATUS
EFIAPI
MemDebugLogWrite (
IN CHAR8 *Buffer,
IN UINTN Length
)
{
EFI_STATUS Status;
if (!mMemDebugLogBufAddrInit) {
//
// Obtain the Memory Debug Log buffer addr from HOB
// NOTE: This is expected to fail until the HOB is created.
//
Status = MemDebugLogAddrFromHOB (&mMemDebugLogBufAddr);
if (EFI_ERROR (Status)) {
mMemDebugLogBufAddr = 0;
} else {
mMemDebugLogBufAddrInit = TRUE;
}
}
if (mMemDebugLogBufAddr) {
Status = MemDebugLogWriteBuffer (mMemDebugLogBufAddr, Buffer, Length);
} else {
//
// HOB has not yet been created, so
// write to the early debug log buffer.
//
if (FixedPcdGet32 (PcdOvmfEarlyMemDebugLogBase) != 0x0) {
Status = MemDebugLogWriteBuffer (
(EFI_PHYSICAL_ADDRESS)(UINTN)FixedPcdGet32 (PcdOvmfEarlyMemDebugLogBase),
Buffer,
Length
);
} else {
Status = EFI_NOT_FOUND;
}
}
return Status;
}
UINT32
EFIAPI
MemDebugLogPages (
VOID
)
{
UINT32 FwCfg_MemDebugLogPages;
UINT32 MemDebugLogBufPages;
EFI_STATUS Status;
//
// Allow FwCfg value to override Pcd.
//
Status = QemuFwCfgParseUint32 ("opt/ovmf/MemDebugLogPages", TRUE, &FwCfg_MemDebugLogPages);
if (Status == EFI_SUCCESS) {
MemDebugLogBufPages = FwCfg_MemDebugLogPages;
} else {
MemDebugLogBufPages = FixedPcdGet32 (PcdMemDebugLogPages);
}
//
// Cap max memory debug log size at MAX_MEM_DEBUG_LOG_PAGES
//
if (MemDebugLogBufPages > MAX_MEM_DEBUG_LOG_PAGES) {
MemDebugLogBufPages = MAX_MEM_DEBUG_LOG_PAGES;
}
return MemDebugLogBufPages;
}
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